Figure 14a. Radiograph (a) and coronal T1-weighted MR image (b) demonstrate a dedifferentiated chondrosarcoma with bimorphic features in the subtrochanteric femur. The radiograph demonstrates cartilage matrix mineralization (black arrow) adjacent to a more aggressive-appearing osteolytic area (arrowheads) with focal cortical destruction (white arrow). The MR image demonstrates an area of low-signal-intensity foci (arrow) that corresponds to the mineralized portion of the tumor, with an unmineralized area inferiorly (arrowheads).